Q: Running really rough, not starting usually. Battery light came on. Car overheated. Headlights turn off when I put the high beams on.

asked by on March 19, 2017

My car hasn't been starting, I thought it was because of the cold. And then I added gas Heet, antifreeze for the gas, 3 bottles, and car started running really rough. Then this morning not start. Finally got it to start this afternoon but was running really rough. Tonight it didn't want to start again but finally got it going. Then the battery light came on while driving and the car temp went all the way up as high as it could go but the heat was blowing out ice cold. I drove home like that. Also the lights turned completely off when I tried turning on the high beams. As long as I didn't turn on the high beams the lights stayed on. What do you thing is wrong??

My car has 210000 miles.
My car has an automatic transmission.

Car is overheating Inspection $94.99 - $114.99 Get a Quote

Hi there. With the information given, it sounds like you accidentally put 3 bottles of Gas Heet (water / antifreeze remover) into the gas tank. There is to be only 1 bottle of Gas Heet to a full fuel tank of fuel. The Gas Heet is heavier than fuel so it will mix with the water and go to the bottom of the fuel tank and block the fuel from entering the engine. When Gas Heet is in the fuel system, as the engine is started, the additives, methanol, water, and gasoline are consumed and burned. All of these combined will make the engine run very hot and unstable. Too much Gas Heet will make the engine run hotter than normal conditions and cause the engine to overheat. I suggest flushing out the fuel system and fuel tank. If you need further assistance with your engine overheating after putting in Gas Heet, then seek out a professional, such as one from Your Mechanic, to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

After heating core replacement, oil gone and engine ruined
Hello. The heater core would not have anything to do with the oil. If anything they may not have properly installed one of the heater hoses which may have causes the coolant to leak which would have caused the engine...
transmission question
The transfer case has its own separate oiling system and does not share fluids with the transmission. The transmission may be having a problem with sucking air from a leak in the valve body or a front pump of the...
Ignition key does not open/lock driver door lock
It depends on the problem. If you have had the ignition lock replaced and are using the key that came with it then it will not have cuts on the key for the door. Make sure you are using the...
my car will turn over but not cranking up.
The symptoms you described lead me to believe that you have a fuel delivery-related problem. I suggest that you check for fuel pressure at the fuel rail. If pressure is within factory specifications, I would then do a fuel flow...
Growling noise in front wheels and steering wheel Mercury Sable
Hello, thanks for writing in. I am happy to help you with the unusual noise issue you are experiencing with your 2003 Mercury. If the noise is NOT occurring during turns when the car is cold, but rather only after...
We have changed the fuel pump, air filter, battery, spark plugs on my nissan xtrail and the car still wont start
Hi. I'm thinking you have a broken timing belt (https://www.yourmechanic.com/services/timing-belt-replacement) causing the SUV not to start. If the timing belt breaks the engine jumps time and the engine has to be in time for it run. If the timing belt...
Failure code P0750
Hey there. The code P0750 (https://www.yourmechanic.com/article/p0750-obd-ii-trouble-code-shift-solenoid-a-malfunction-by-spencer-clayton) pertains to a shift solenoid. I would clear the code and test drive the truck while monitoring the shift solenoid's values and operation. Afterwards recheck for the code, stored or pending. Perform a battery...
Steering shakes when I get to 100 kph, also makes a scrubbing noise in front over bumps/driveways 2003 Holden Commodore (VY)
Hi there - sounds like your tires/wheels are out of balance, out of round or you have a bent wheel. The "scrubbing" noise when the front suspension is compressed going over bumps also suggests that the tires are rubbing on...
1983 toyota corolla 69k miles on it and when I'm driving it acts like it wont take any gas.
If the exhaust smells like gasoline, the fuel mixture is either way too rich or you have a weak ignition system that is not burning the fuel efficiently. You can pull spark plugs out to check them and if they...

Related articles

A Buyer's Guide to the 2012 Mazda 2
For For those of you who really just want a car for the sake of transportation—and not towing or for a job where you need to transport tools—you might want to consider the 2012 Mazda 2. This car may not...
How to Prevent and Handle an Overheated Engine
An overheated engine can seize the motor completely. Learn how to prevent your engine from getting too hot and causing damage.
How Long Does a Speed Control Assembly Last?
Using Using the gas pedal allows you to speed up and control the car on the road, but it can be a chore when driving long distances on relatively flat roads with little to no other traffic. It can lead...